Properties of Matter Mixtures and Solutions：物质的混合物和溶液性质.pptVIP

22. Factors that may affect the rate or speed the solute dissolves: Particle size or surface area: SMALLER size will usually dissolve FASTER. Think about this: would a sugar cube or a sugar packet of loose sugar dissolve easier in water? The packet because the pieces are smaller than the compacted cube. We can CRUSH a substance to make it smaller. ? Stirring or SHAKING the solute in the solvent. Temperature changes: when HEAT is increased, more solute will dissolve faster. 23. Concentrated or concentration: when the solute is GREATER than the solvent, it can’t completely dissolve. The solute that does not dissolve will be LEFT AT THE BOTTOM. 24. Dilute or dilution: to LESSEN the strength of a solution by MIXING it with more liquid or more SOLVENT. Some cleaning supplies can be DILUTED with water to weaken their strength. If your tea or lemonade is too sweet, you can dilute it with water. 25. POLLUTION or harmful substances in our environment result from the MIXING OR DISSOLVING of foreign substances in water, air, and soil. They are often created as a result of industry, agriculture, burning FOSSIL FUELS, and other human activities. Examples: COFFEE FILTERS, strainers/colanders in your kitchen 10. Sifting: used to separate SMALLER solid particles from LARGER solid particles. The mixture is put into a container with various sized SCREENS, is shaken, and then the smaller particles go through the screen and leave the larger particles in the container. 11. Magnetic attraction: used to separate MAGNETIC material from a mixture of other substances. Did you know that a “cow magnet” is given to a cow to swallow? It stays in the cow’s first stomach to keep magnetic material like wire and other hurtful materials from going into the rest of its digestive system! What are Cow Magnets?Cow magnets are popular with dairy farmers and veterinarians to help prevent Hardware Disease in cattle. While grazing, cows eat everything from grass and dirt to nails, s